Which of these statements is true with regard to this animation? which of these statements is true with regard to this animation? sodium and potassium ions are transported against their concentration gradients. the cell is not expending energy. sodium ions are transported down their concentration gradient. potassium ions are transported down their concentration gradient. the cell does not expend atp?

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos